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MLK-24708 spi: imx: handle EPROBE_DEFER when get cs-gpios number 

If SPI is probed before the GPIO driver, it may miss the cs-gpio
configuration in dtb.
Add defer probe handler to wait GPIO driver probe.

Reviewed-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
(cherry picked from commit c2b2a4d1006b48ab311d2f948e83490d8ea453f5)
5.4-rM2-2.2.x-imx-squashed
Clark Wang 2020-09-01 18:27:43 +08:00
parent 8660d4e1be
commit a6d5b357da
1 changed files with 6 additions and 1 deletions
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7
drivers/spi/spi-imx.c
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@ -1775,8 +1775,13 @@ static int spi_imx_probe(struct platform_device *pdev)
/* Request GPIO CS lines, if any */
if (!spi_imx->slave_mode && master->cs_gpios) {
for (i = 0; i < master->num_chipselect; i++) {
if (!gpio_is_valid(master->cs_gpios[i]))
if (!gpio_is_valid(master->cs_gpios[i])) {
if (master->cs_gpios[i] == -EPROBE_DEFER) {
ret = -EPROBE_DEFER;
goto out_spi_bitbang;
}
continue;
}
ret = devm_gpio_request(&pdev->dev,
master->cs_gpios[i],